EP2379788B1 - Method for predicting an unbalance, corresponding apparatus and domestic appliance having an apparatus of this type - Google Patents

Description

The present invention relates to a method for predicting or occurring in a drum of a household appliance for the care of laundry caused by a distribution of the laundry items in an interior of the drum caused imbalance, wherein the predictions in a lower value range of a speed, in particular in a Laundry distribution operation is performed, and a value and / or a course of the imbalance for an upper value range of the speed, in particular for a centrifugal operation, is determined. Moreover, the present invention relates to a corresponding device for predicting an unbalance or a household appliance with such a device.

Washing machines usually have an electronically controlled drive. Before a transition to a so-called spin operation, a drum is accelerated over a fixed slow laundry distribution operation and an unbalance estimated. In this case, the estimation of the unbalance usually takes place via an engine speed or a loading of the drum. It is always possible to cancel the spin mode or to influence the further spin cycle. For this purpose, methods are known from the prior art in many ways, in which the unbalance is determined from a speed or current profile. In addition, it is known to carry out a correction of the measured value of the imbalance with respect to the laundry load, wherein the laundry load was determined once before or at the beginning of a spin cycle.

One method of predicting an imbalance that forms during spin-drying of laundry is over DE 10 2006 032 337 A1 known. In this method, the amplitude of the movement of a spring-supported tub of a washing machine and the speed of a laundry drum arranged in the tub during a spin cycle is determined. From the amplitude of movement and the drum speed, the change in amplitude over the speed is also determined and the further spin cycle in dependence of this controlled amplitude change controlled. In addition, in one embodiment of the in DE 10 2006 032 337 A1 disclosed method extrapolated from the determined values for the speed, the amplitude and the amplitude change for a possible speed of the further spin cycle.

A method for determining a redistribution or an imbalance change is out DE 197 38 310 A1 known. In this method, the amplitude response of Niesswerten is calculated and based on an unbalance change determined.

There is a particular interest in determining the imbalance at the earliest possible time, so that a corresponding correction and a regulation of the spin cycle are ensured. Consequently, the known methods are merely predicting or predicting the imbalance, since it may still change during the further spin cycle. One of the main reasons for this is that, at the time of the prognosis, water bound to the laundry is thrown out over time. As a result, during a spin cycle, even with firmly attached to the drum wall laundry, constantly changing the training imbalance and mass of wet laundry. Both variables significantly influence the amplitude of movement of the tub during the spin cycle.

The object of the present invention is to propose a method and a device or a household appliance with such a device, which ensure an early and reliable predictions of imbalance.

This object is achieved according to the invention by a method having the features according to claim 1, and by a device having the features according to claim 11 and a domestic appliance having the features according to claim 13. Advantageous embodiments of the invention are specified in the subclaims; which can be combined individually or in any combination with claim 1, 11 or 13, if such a combination is technically possible and useful. The features of the method and its advantageous embodiments also define a household appliance, which the mentioned in the features inputs or devices or comprises the inputs or devices designed to carry out the individual method steps.

An inventive method is for predicting or predicting occurring in a drum of a household appliance for the care of laundry, by a distribution of laundry items designed in an interior of the drum caused imbalance. In this method, the prediction is carried out in a lower value range of a rotational speed, in particular in a laundry distribution mode, and a value and / or a progression of the imbalance is determined for an upper value range of the rotational speed, in particular for a centrifugal operation. An essential idea of the invention is that the imbalance is predicted as a function of a measurement and / or control variable, wherein a behavior of movement of a vibration system of the household appliance is characterized by the measurement and / or control variable.

The term household appliance is understood here in particular a washing machine. The term also includes other household appliances for the care of laundry items, such as a dryer or a washer-dryer.

In other words, a basic idea of the present invention is to predict the imbalance on the basis of a measurement and / or control quantity which characterizes a change in weight of wet laundry items during a spin operation or drainage. In particular, an amplitude of the measured and / or control variable, preferably an average amplitude, is determined, wherein the prediction or prediction is preferably dependent on the ascertained amplitude and the rotational speed is made. Preferably, the lower value range of the rotational speed, in which the prognosis of the imbalance is performed, on the basis of a course of the measured and / or control variable, in particular a curve of the average amplitude, selected in dependence of the rotational speed, and resonances occurring in this course preferably considered. In particular, it can be provided that the measurement of the amplitude of the measured and / or control variable takes place at a speed of about 235 revolutions per minute, whereby the forecast of the imbalance can be improved. Advantageously, it is achieved by the method according to the invention that a very reliable prediction of the imbalance for the upper value range of the rotational speed, in particular for the centrifugal operation, can be made and the imbalance can be determined. In this way, moreover, it is achieved that the spin time can be saved, since an optimum spin cycle or an improved control of the rotational speed can be carried out early.

Preferably, a path signal is selected as the measurement and / or control variable, which characterizes a deflection of a tub of the household appliance from a rest position. It can be provided that the path signal is generated by means of a displacement sensor, which is preferably arranged in a spring piston damper of the tub. The term deflection of the tub is understood in particular an amplitude with which the tub swings to a rest position. In particular, an average amplitude of the path signal over at least half a period, in particular over one to three periods, is determined for predicting the imbalance, wherein the average amplitude is preferably determined from a distance between an upper and a lower envelope of the course of the path signal. Preferably, an imbalance mass directly as a function of the deflection of the tub, in particular as a function of the average amplitude of the path signal can be determined. Since the path signal from a value of the rotational speed of about 800 revolutions per minute due to its asymptotic course has virtually no changes in amplitude, it is of particular interest, the imbalance or the deflection of the tub from the rest position for this value of the speed predict. The imbalance is then in particular a measure of the imbalance occurring in the centrifugal operation.

In an embodiment, it can be provided that for predicting the imbalance, a jump behavior of a profile of the measured and / or control variable, in particular of a path signal, is filtered. In particular, jumps of an average value of the measurement and / or control variable, in particular a sudden behavior of a rest position of the tub, are filtered. In particular, in the case that a spring piston damper is used, the rest position of the tub changes partially leaps and bounds. These jumps are not a consequence of a change in weight of the laundry items or a drainage, but result from a sudden change in position of a friction element within the spring piston damper. These jumps are preferably removed by means of a suitable filter from the course of the measured and / or control variable, in particular the path signal. This ensures that the imbalance can be determined more accurately.

Preferably, the measurement and / or control variable, in particular a path signal, from a time of a first complete emptying of a tub of the household appliance is observed.

In one embodiment, it can be provided that, when predicting or predicting the imbalance, a correction value of a drainage is determined, and the imbalance determined in advance is corrected by the determined correction value, in particular is corrected additively. In particular, during the observation of the measurement and / or control variable, in particular the path signal, a compensation function is determined, by means of which a value of a residual drainage is extrapolated to spin operation. The compensation function preferably has an exponential component. Preferably, the correction value is limited to a value range of about -0.05 mm to about 0.7 mm. In this context, dewatering means, in particular, a dispensing of water and a compression of the items of laundry.

In particular, a possible error of the unbalance forecast can be justified such that at large loadings of the drum an end imbalance by dispensing water and compression of the laundry or by the drainage is smaller, with the rule that the smaller the load of the drum, the weaker this Effect is. For this purpose, the correction of the drainage is particularly advantageous. In addition, when determining the correction value, a loading state of the drum is preferably determined.

In particular, the correction value of the dewatering by which the predicted imbalance is corrected, depending on a slope of an average value of the measured and / or control variable and / or a sum of squares, of a change in the mean value of the measured and / or control variable compared to previous rotation of the drum and / or extrapolated residual drainage.

The method according to the invention is characterized in that it can be used for different laundry loads or it can be adjusted to a current loading situation.

A device according to the invention is designed for predicting or forecasting an imbalance occurring in a drum of a domestic appliance for the care of items of laundry caused by a distribution of the items of laundry in an interior space of the drum. The device comprises an imbalance prediction device, by means of which the predictions in a lower value range of a speed, in particular in a laundry distribution operation, feasible, and a value and / or a course of imbalance for an upper value range of the speed, in particular for a spin operation, can be determined. An essential idea is that the imbalance prediction device is designed to predict the imbalance as a function of a measurement and / or control variable, which is a change in a weight of wet items during a spin operation or a drainage. Preferably, a movement behavior of a vibration system of the household appliance can also be characterized by the measurement and / or control variable.

Advantageous embodiments of the method according to the invention are to be regarded as advantageous embodiments of the device according to the invention. The method steps at the same time define means for performing the method steps, wherein the devices can be comprised by or connected to the device for predicting an imbalance.

Fig. 1

einen Verlauf einer Drehzahl sowie einen Verlauf eines Wegsignals eines Laugenbehälters über die Zeit;

Fig. 2

einen Vergleich einer Unwuchtprognose bei zwei verschiedenen Beladungen einer Trommel;

Fig. 3

für zwei verschiedene Beladungen der Trommel jeweils einen Verlauf einer Änderung einer Ruhestellung eines Laugenbehälters, einen Verlauf einer relativen Änderung der Ruhestellung des Laugenbehälters sowie einen Verlauf einer Drehzahl;

Fig. 4

einen beispielhaften Verlauf einer relativen Änderung der Ruhestellung des Laugenbehälters zur Erläuterung einer Bestimmung einer Ausgleichsfunktion;

Fig. 5

eine schematischen Darstellung einer Waschmaschine.

Further advantages, features and details of the invention will become apparent from the following description of individual preferred embodiments and with reference to the drawings. Showing:

Fig. 1

a course of a rotational speed and a course of a travel signal of a tub over time;

Fig. 2

a comparison of an imbalance forecast at two different loads of a drum;

Fig. 3

for two different loadings of the drum in each case a course of a change in a rest position of a tub, a course of a relative change in the rest position of the tub and a course of a speed;

Fig. 4

an exemplary course of a relative change in the rest position of the tub to explain a determination of a compensation function;

Fig. 5

a schematic representation of a washing machine.

The method according to the invention will be explained in more detail below by means of an example. Given is an in Fig. 5 shown domestic appliance for the care of laundry items 7, in this case a washing machine, which in a housing 1 has a suspended on springs 8 tub 3 with a rotatably mounted drum 2 therein. At the tub 3, a balance weight 10 is attached. The drum 2 is driven by a motor 5 via a belt 4. In a damper 6 of the tub 3 a not shown displacement sensor is arranged in the present example, which is able to detect a deflection of the tub 3 from a rest position, and to generate a signal characterizing this deflection. In the present embodiment, the damper is designed as a so-called spring piston damper 6. In the context of the invention, other dampers with an associated displacement sensor, which detects the movement of the damper, can be applied. Hereinafter, this signal is referred to as a path signal. The invention also includes alternative arrangements of the sensor, if such a sensor can detect a movement of the tub 3 relative to the housing 1.

Furthermore, the household appliance comprises a controller 9, which are electrically connected to electrical consumers, such as the motor 5, and measuring devices, such as the displacement sensor. The controller 9 is designed so that the control signals required for operating the household appliance are generated and that the signals detected by the measuring devices can be evaluated by means encompassed by the controller. Such a controller 9 may itself comprise the device for predicting the unbalance caused in the drum 2 or be connected to such a device. Depending on the imbalance E _800p determined by the device for predicting the imbalance, the controller 9 can generate control signals which influence the further program _sequence , in particular the centrifugal _mode with regard to the control and / or regulation of the rpm Drum 2. Thus, for example, a reduction of a drum speed when exceeding a predetermined unbalance limit for the determined imbalance E _800p possible to avoid excessive movements of the tub 3 and excessive mechanical loads.

In the present case, the interest applies to predicting or predicting an imbalance occurring in the drum 2 of the household appliance, caused by a distribution of the laundry items 7 in an interior of the drum 2. The prediction of the imbalance takes place in a lower value range of a rotational speed n of the drum 2, in the present example in a laundry distribution operation of the washing machine. As a result of the prediction, a value or a course of the imbalance for an upper value range of the rotational speed n is determined in the present case. In the present case, the upper value range of the rotational speed n is understood to mean a centrifugal operation of the washing machine, which is carried out during a washing process, in particular after the laundry distribution operation.

To predict the unbalance, the household appliance in the present case comprises a displacement sensor, which is preferably mounted in a spring piston damper 6 of a liquor container 3 arranged in the household appliance. Instead of the displacement sensor may alternatively be provided an acceleration sensor. The displacement sensor has the task to detect a deflection of the tub 3 from a rest position, and then to generate a displacement signal characterizing this deflection. In the present case, the path signal is used for predicting or predicting the imbalance caused by the distribution of the laundry items 7 in the drum 2.

Fig. 1 indicates an exemplary course of a rotational speed n (top) as well as a course of a path signal W marked underneath and associated with the rotational speed n. As already mentioned, the path signal W corresponds to a deflection of the tub 3 from a rest position. In order to determine the imbalance forecast, an actual amplitude from the path signal W of a last drum revolution is initially calculated in the present case. In this case, an average amplitude of the envelope of the path signal W over at least half a period, ie over at least half a drum rotation, preferably over two to three periods, determined. This average amplitude then represents a measure of the current unbalance. Since the amplitude of the Path signal W has an asymptotic course from a certain speed of about 800 revolutions per minute, in the present case is of particular interest to predict the imbalance occurring at this speed of about 800 revolutions per minute. On the unbalance occurring in the spin mode can then be closed directly from the determined for the speed of 800 revolutions per minute unbalance. The speed selected for this embodiment of 800 revolutions per minute depends on device-specific parameters. The speed is selected to be well above the resonance speed.

wobei A die Amplitude des Wegsignals W bezeichnet. Daraus ergibt sich eine Abhängigkeit der bei der Drehzahl von 800 Umdrehungen pro Minute auftretenden Unwucht wie folgt: $$\frac{\mathrm{1}}{{\mathrm{E}}_{\mathrm{800}}\left(\mathrm{n}\right)}\mathrm{=}{\mathrm{p}}_{\mathrm{1}}\mathrm{+}\frac{{\mathrm{p}}_{\mathrm{2}}{\mathrm{n}}_{\mathrm{2}}}{\sqrt{{\left({\mathrm{n}}^{\mathrm{2}}\mathrm{+}{\mathrm{p}}_{\mathrm{3}}^{\mathrm{2}}\right)}^{\mathrm{2}}\mathrm{+}{\mathrm{p}}_{\mathrm{4}}^{\mathrm{2}}}}\mathrm{,}$$

wobei p₁, p₂, p₃, p₄ vorliegend anzupassende Koeffizienten sind. Somit kann die bei der Drehzahl von 800 Umdrehungen pro Minute, und damit bei dem Schleuderbetrieb auftretende Unwucht E₈₀₀ bei jeder beliebigen Drehzahl n aus der aktuellen Amplitude des Wegsignals W vorhergesagt werden. Betrachtet man einen Verlauf der Amplitude des Wegsignals W in Abhängigkeit der Drehzahl n, so kann festgestellt werden, dass eine erste Resonanz bei einer Drehzahl n von etwa 190 bis 200 Umdrehungen pro Minute auftritt. Unterhalb der ersten Resonanzdrehzahl kann ein großer Prognosefehler festgestellt werden, wobei sich durch das Voraussagen der Unwucht E₈₀₀ bei einer Drehzahl n von etwa 235 Umdrehungen pro Minute die Prognose drastisch verbessert.Thus, the occurring at the speed of 800 revolutions per minute amplitude of the path signal W as a function of the current amplitude of the path signal W and the current speed n is predicted. In the present case, the following formula applies $${\mathrm{<figure-callout\; id="800"\; label="e"\; filenames="imgf0001.png"\; state="\{\{state\}\}">e</figure-callout>}}_{\mathrm{800}}\mathrm{=}{\mathrm{e}}_{\mathrm{800}}\left(\mathrm{A},\mathrm{n}\right)\mathrm{=}\mathrm{A}\mathrm{\cdot }{\mathrm{e}}_{\mathrm{800}}\left(\mathrm{n}\right)\mathrm{.}$$

where A denotes the amplitude of the path signal W. This results in a dependence of the imbalance occurring at the speed of 800 revolutions per minute as follows: $$\frac{\mathrm{1}}{{\mathrm{e}}_{\mathrm{800}}\left(\mathrm{n}\right)}\mathrm{=}{\mathrm{<figure-callout\; id="1"\; label="p"\; filenames="imgf0001.png,imgf0003.png"\; state="\{\{state\}\}">p</figure-callout>}}_{\mathrm{1}}\mathrm{+}\frac{{\mathrm{<figure-callout\; id="2"\; label="p"\; filenames="imgf0001.png,imgf0003.png"\; state="\{\{state\}\}">p</figure-callout>}}_{\mathrm{2}}{\mathrm{n}}_{\mathrm{2}}}{\sqrt{{\left({\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="imgf0001.png,imgf0003.png"\; state="\{\{state\}\}">n</figure-callout>}}^{\mathrm{2}}\mathrm{+}{\mathrm{<figure-callout\; id="3"\; label="p"\; filenames="imgf0001.png,imgf0003.png"\; state="\{\{state\}\}">p</figure-callout>}}_{\mathrm{3}}^{\mathrm{2}}\right)}^{\mathrm{2}}\mathrm{+}{\mathrm{<figure-callout\; id="4"\; label="p"\; filenames="imgf0001.png,imgf0003.png"\; state="\{\{state\}\}">p</figure-callout>}}_{\mathrm{4}}^{\mathrm{2}}}}\mathrm{.}$$

where p ₁ , p ₂ , p ₃ , p ₄ are coefficients to be adjusted herein. Thus, the imbalance E ₈₀₀ occurring at the speed of 800 revolutions per minute, and thus in the centrifugal operation can be predicted at any rotational speed n from the current amplitude of the path signal W. Considering a profile of the amplitude of the path signal W as a function of the rotational speed n, it can be determined that a first resonance occurs at a rotational speed n of approximately 190 to 200 revolutions per minute. Below the first resonance speed, a large prognosis error can be determined, whereby the prediction of the unbalance E ₈₀₀ drastically improves the prognosis at a speed n of approximately 235 rpm.

Fig. 2 gives a comparison of a predicted imbalance E _800p and a measured imbalance E _800g at a speed of about 800 revolutions per minute. In Fig. 2 on the left is the comparison for a large loading of the drum 2 and on the right the comparison for a small loading of the drum 2 is shown. As can be seen, the predicted value of the unbalance E _800p at the large loading of the drum 2 shows a good agreement with the measured value of the imbalance E ₈₀₀ g. In contrast, the predicted value of the imbalance E _800p for smaller loads of the drum 2 shows less dispersion, but a systematic underestimation of the actual imbalance E _800g . This is in Fig. 2 to the right. This systematic deviation increases with decreasing load. The systematic error can be justified such that at large loads of the drum 2, the imbalance by dispensing water and compression of the laundry items 7 is smaller, the smaller the load of the drum 2, the weaker this effect. The dispensing of water and compression of the laundry items 7 will be referred to hereinafter as dewatering. With renewed reference to Fig. 1 It can be recognized that the path signal W has a vibration about an average value, wherein the mean value corresponds to a rest position of the tub 3. As in Fig. 1 is drawn, this rest position changes with the time t, which is due to the discharge of water and the compression of the laundry items 7 and to the drainage.

In order to take into account the systematic error, a correction of the dewatering of the predicted unbalance is made in the present case. Fig. 3 are courses of a change in the rest position M of the tub 3 and curves of the speed n as a function of the number s of the drum revolutions for a small (left) and a large (right) loading of the drum 2 again. The upper curves each show a course of change in the rest position M of the tub 3 versus the number s of drum revolutions, the middle curves each show a course of the relative change in the rest position M of the tub 3. Moreover, the lower curves each represent a curve of the rotational speed n versus the number s of the drum revolutions. Since the spring piston damper 6 is used in the present example, the rest position M changes, as in FIG Fig. 3 marked, partly leaps and bounds. These cracks are not due to a weight change during drainage, but result from a sudden change in position of a friction element within the spring piston damper 6. These jumps are here Removed by means of a filter from the course, as in the course of the relative change in the rest position M in Fig. 3 the case is. In Fig. 4 an exemplary course of the relative change of the rest position M of the tub 3 as a function of the number s of the drum revolutions is shown. Based on Fig. 4 The determination of the correction of the drainage will now be explained in more detail.

At this point, it should be mentioned that the measurement and the observation of the path signal W begin at a time of a first complete emptying of the tub 3 and the beginning of a laundry dehumidification by means of rotational movement. From this point on, the relative change of the rest position M of the tub 3 is observed. During the observation, a compensation function is determined continuously or sequentially, whereby a residual dewatering is extrapolated to the spin operation on the basis of the compensation function. The compensation function is determined according to the following formula: $${\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="imgf0001.png,imgf0003.png"\; state="\{\{state\}\}">k</figure-callout>}}_{\mathrm{1}}\mathrm{+}{\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="imgf0001.png,imgf0003.png"\; state="\{\{state\}\}">k</figure-callout>}}_{\mathrm{2}}\mathrm{\cdot }\mathrm{<figure-callout\; id="3"\; label="exp\; k"\; filenames="imgf0001.png,imgf0003.png"\; state="\{\{state\}\}">exp\; </figure-callout>}\left({\mathrm{k}}_{}\right)\left({\mathrm{}}_{\mathrm{3}}\mathrm{\cdot }\mathrm{s}\right)\mathrm{,}$$

In this case, k ₁ , k ₂ , k _{3 designate} parameters which are adapted to the above formula. Moreover, s denotes the number of drum revolutions since the start of laundry dehydration. This compensation function and moreover an approximation of the compensation function are in Fig. 4 shown by the solid or dashed curve.

In the present case, the predicted value of imbalance E _{800p is additionally} corrected by the correction value of the drainage. The correction value of the drainage can be limited to a specific interval, for example from -0.05 to 0.7 mm. In the present case, it should be mentioned that the correction value is dependent on the extrapolated residual drainage, a slope of a linear compensation function (k ₁ + k ₂ · s) and a sum of the squares of the change in the rest position M compared to the preceding drum rotation. In the present case, this relationship is adapted by a neural network with three input nodes and one output node, wherein a transfer function and three weights are assigned to the neural network.

Claims (13)

1. Method for predicting an imbalance (E_800p), which occurs in a drum (2) of a domestic appliance for treatment of items of laundry (7) and which is caused by distribution of the items of laundry (7) in an interior space of the drum (2), the drum being rotatably mounted in a solution container, wherein the prediction is carried out in a lower values range of a rotational speed (n), particularly in a laundry distribution operation, and a value and/or a plot of the imbalance (E_800p) is determined for an upper values range of the rotational speed (n = 800 rpm), particularly for a spinning operation, characterised in that the imbalance (E_800p) is predicted in dependence on a measurement magnitude and/or control magnitude (W) characterising a change in a weight of wet items of laundry during a spinning operation or a water removal process.
2. Method according to claim 1, characterised in that a signal, particularly a travel signal (W), which characterises the movement behaviour of an oscillatory system of the domestic appliance, is selected as the measurement magnitude and/or control magnitude.
3. Method according to claim 2, characterised in that a signal, particularly a travel signal (W), which characterises a deflection of the solution container (3) from a rest setting as the movement behaviour of the oscillatory system, is selected as the measurement magnitude and/or control magnitude.
4. Method according to claim 3, characterised in that the travel signal (W) is generated by means of a travel sensor which is present in the domestic appliance and which is arranged, in particular, in a spring-piston damper (6) of the solution container (3).
5. Method according to any one of the preceding claims, characterised in that a step behaviour of a plot of the measurement magnitude and/or control magnitude, particularly a travel signal (W), is filtered for prediction of the imbalance (E_800p).
6. Method according to any one of the preceding claims, characterised in that the measurement magnitude and/or control magnitude, particularly a travel signal (W), is observed from an instant of a first complete emptying of a solution container (3) of the domestic appliance.
7. Method according to any one of the preceding claims, characterised in that for prediction of the imbalance (E_800p) a correction value of a water removal process is determined and the previously determined imbalance (E_800p) is corrected by the determined correction value, particularly additively corrected.
8. Method according to claim 7, characterised in that the correction value of the water removal process is determined in dependence on a change in a mean value (M) of the measurement magnitude and/or control magnitude (W), particularly in dependence on a change in a rest setting (M) of a solution container (3).
9. Method according to one of claims 7 and 8, characterised in that a plot of the water removal process is extrapolated on the basis of an equalising function up to an instant of the spinning operation.
10. Method according to claim 9, characterised in that the equalising function has an exponential component.
11. Device for prediction of an imbalance (E_800p), which arises in a drum (2) of a domestic appliance for the treatment of items of laundry (7) and which is caused by distribution of the items of laundry (7) in an interior space of the drum (2), the drum being rotatably mounted in a solution container (3), with an imbalance prognosis device by means of which the prediction can be performed in a lower values range of a rotational speed (n), particularly in a laundry distribution operation, and a value and/or a plot of the imbalance (E_800p) for an upper values range of the rotational speed (n = 800 rpm), particularly for a spinning operation, is determinable, characterised in that the imbalance prognosis device is constructed for prediction of the imbalance (E_800p) in dependence on a measurement magnitude and/or control magnitude (W) which characterises a change in a weight of wet items of laundry during a spinning operation or a water removal process.
12. Device according to claim 11, characterised in that in addition a movement behaviour of an oscillatory system of the domestic appliance is characterised by the measurement magnitude and/or control magnitude (W).
13. Domestic appliance, particularly washing machine or washer/dryer, for performing a method according to any one of claims 1 to 10, characterised in that a device according to claim 11 or 12 is present.

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